A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions.

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2
votes
1answer
131 views

Mapping out 3D points with QGIS2threejs

I have some points I would like to map out in 3D. The points were gotten from a GPS module athat was attached to a Raspberry Pi. This is the settings I used before starting qgis2threejs: This was ...
1
vote
1answer
84 views

Changing CRS in QGIS due to pop up window: "CRS warning! Warning: Input layers have non-matching CRS. This may cause unexpected results.” [duplicate]

I'm using GIS to map the movement of animals and their speed and density in different habitat types using shape polygons. When I got to the step ;Count points in polygon' a pop up window appeared ...
6
votes
2answers
77 views

Inferring lat/lon based on known location coordinates

I have a point dataset with a set of coordinates that is in an unknown projection. For some of these points I know the unprojected latitude and longitude. Based on these known data points, would it be ...
3
votes
2answers
50 views

Adding Excel file with degrees to map with CRS in QGIS?

How can I add a layer with X,Y in degrees (from an excelfile) to a map with CRS? I am using QGIS 2.8.2
1
vote
0answers
29 views

Same CRS but different units of raster cells in qgis

I have two rasters with the same CRS (WGS 84/UTM 34N). One is from a LiDAR scan and the other raster is created thru interpolation of point measurements by me. I would like to change the cell size to ...
1
vote
0answers
63 views

Convert Coordinate Notation tool

I am having trouble using the CCN tool. My data is a DMS 442315 1214598 and I need to be in DD to work with my county data which I know is in the correct format. I tried adding a new field then ...
3
votes
0answers
42 views

Choosing projection for routes that fall within two UTM zones? [duplicate]

I'm creating charts for routes that fall within two UTM zones; 30S and 31S. The offshore routes are in the Alboran / Balearic Sea - connecting Spain to Algeria. What projection should I use?
3
votes
2answers
120 views

What is a suitable map projection for the entire state of Idaho?

I am working with some sample GIS data for Idaho. The data is in geographic coordinates but I want it in projected coordinates. I am unsure how to address the issue of projection as Idaho crosses ...
-3
votes
1answer
97 views

Same coordinate system - shapefiles don't overlap [duplicate]

I have two shapefiles and two rasters (dem), and while I put them in the same coordinate system (Greek grid), it seems that they don't overlap. But one is the boundaries of a county, and another the ...
3
votes
1answer
60 views

Projection Problem on Oracle Spatial

I would like to transform SDO_GEOMETRY from WGS84 projection to my custom projection in Oracle Database. Details for custom projection is as follows: +proj=lcc +lat_1=40.5 +lat_2=37.5 +lat_0=25 +...
1
vote
1answer
44 views

Identify Hawaiian coordinate system

I've come across the following coordinates: x = 600907.76 y = 2437133 It's a coordinate located in Hawaii. I thought it was UTM, but the negative x coordinate makes me think otherwise. Anyone know ...
3
votes
0answers
95 views

Overlaying WMS in custom coordinate system with other layers in openlayers 3

I have a raster in a custom coordinate system (I added the coordinate system definition to the geoserver EPSG file so that I could choose it as the native projection. Now I would like to add it to a ...
4
votes
1answer
49 views

How to use Prolong Line feature with an input layer in WGS84?

I have a source point table in SRID:4326, and to make it look geographically accurate, I project my project file to SRID:2877 (State Plane CO) (layer still reports source CRS of SRID:4326). In order ...
3
votes
1answer
109 views

Exact conversion of ECEF to geodetic coordinates

I came across the paper "Exact conversion of Earth-centered Earth-fixed coordinates to geodetic coordinates", which describes a series of equations which can be used to calculate a set of geodetic ...
3
votes
2answers
100 views

How to change the coordinates of Shapefiles from another GIS platform to QGIS

I have over 800 shapefiles which when paired with google maps/bing maps, the point is off by at least 1000 km. Been scratching my head to make this work by changing the default CRS. (Previously was in ...
3
votes
1answer
96 views

How to use a png image as a correctly georeferenced background in order to trace lines from it?

I have a png image which looks like this and has some lines which I need to trace (the green and red lines): The coordinate system of the map from which the image is taken is EPSG: 3034. How can I ...
4
votes
1answer
46 views

Linking Data Frames with Different Coordinate Systems

I have a problem that I am hoping might have multiple solutions. I am working with research data that was collected on an arbitrary grid, with units in m, datum point of 1000E, 1000N. The grid is ...
3
votes
3answers
213 views

how to add grid coordinates in QGIS 2.12.0-Lyon in the print composer canvas?

The attached image is the municipal basmap created using QGIS. I was not able to add the grid coordinates in the print composer canvas. How do I add those coordinates?
0
votes
0answers
24 views

Can I use the bounding coordinates of a coordinate system to determine the coordinate system for undefined coordinate values?

I have a table with coordinates that are undefined, but I know they could be in several different state plane zones/datums. I am thinking I can possibly use coordinate ranges to assign the coordinate ...
0
votes
1answer
34 views

Using different CRS for map and data?

I followed the tutorial from http://schoolofdata.org/2013/04/27/creating-a-map-using-qgis The France map is from NaturalEarthData and tour de france data is from another source. They used different ...
3
votes
1answer
156 views

Difference between datum and ellipsoid for geodetic coordinates?

Looking at the Wikipedia page for the North American Datum, it seems to imply that the datum is completely defined by the ellipsoid, which defines the major/semi-major axes, flattening, etc. For ...
0
votes
0answers
59 views

GPS coordinates of a point between two known points

I am looking for an algorithm for finding GPS coordinate of a point on a straight line defined by say points p1 and p2 at distance r from p1. GPS coordinate of p1 and p2 are known. I searched a lot on ...
3
votes
1answer
58 views

How to find Coordinate System of datasets inside MDB and GDB

I have been given some ESRI personal geodatabase files (MDB) and file geodatabase files (GDB). I don't know the coordinate system(s) for these files. Is there a way to do this without using ESRI ...
3
votes
1answer
154 views

Converting coordinates in Florida, USA?

I have an point location and the information given is: Easting: 519122.06 Northing: 1290630.07 Original thought was it's UTM, but does not appear to be correct because I know the point needs to be ...
1
vote
0answers
96 views

Correctly Setting Spatial Reference for Geometry Objects when Geoprocessing

I'm attempting to find the nearest distance between a set of points, and a set of polygons. I don't want to use near tables because I have to do this operation for a large number of different ...
3
votes
1answer
48 views

using a linear solver to get a “centre of gravity” of a set of points

As a programmer, if I have a linear solver available. How can I formulate the following problem as a set of constrains / decisions / goals for the linear solver? I have a matrix of say 10*10, so 100 ...
3
votes
2answers
129 views

Reading Lambert Conformal Conic NetCDF into GeoServer?

I'm working on reading in a NetCDF file into GeoServer and GeoServer has no problem reading it in as a data store, but when I go to publish the layer from the data store I get an error that states "...
0
votes
2answers
78 views

Latitude / Longitude Polygon from New Zealand Geodatabase or Shapefile?

I have access to ESRI Geodatabase and Shapefile: http://www.stats.govt.nz/browse_for_stats/Maps_and_geography/Geographic-areas/digital-boundary-files.aspx. What I need is to somehow get the polygons ...
1
vote
1answer
61 views

Define Projections for layers with multiple locations in MXD's

# Script to use Layers in MXD source file paths to locate and redefine projections import arcpy, glob, os, sys, arcgisscripting mxd = arcpy.mapping.MapDocument("N:\MXDs\_ThomaKL\MXD GPS Valves\...
2
votes
1answer
57 views

Calculating Angle between two GPS Coordinates in QGIS

i'm looking to create an angle attribute inside a layer of points that has a starting coordinate and a finishing coordinate. The angle needs to be 0-360. Is there a field calculator command that I ...
1
vote
2answers
40 views

Trying to maintain spatial reference on newly created numpy array

I am trying to copy the values from raster into newly created array and then trying to save the array with same spatial reference as raster file inRas = arcpy.GetParameterAsText(0) double_layer = ...
0
votes
0answers
38 views

Is the GCJ-02 coordinate reference system available in QGIS?

I am trying to calculate distances between points in a Chinese province. The measure tool and distance matrix both provide the distance in terms of degrees. I read earlier that I need to change the ...
1
vote
2answers
70 views

Redefining point shapefiles in MXD that have no projection and are located in different folders using ArcPy?

# Script to use Layers in MXD source file paths to locate and redefine projections import arcpy, glob, os, sys, arcgisscripting from arcpy import env, mapping path = os.getcwd() env.workspace = path ...
1
vote
1answer
62 views

How to change the extent of a raster after converting its coordinates?

I changed the coordinate system from Conical coordinates to lat/long UTM-39N. It's OK, but the new layer doesn't have appropriate extent, so it can't be plot on other layers. I exported the raster ...
3
votes
2answers
55 views

Alaska Series E projection in ArcGIS for Desktop?

I am trying to digitize a scanned map that appears to be in the Alaska Series E projection. I have also seen this referred to as Modified Transverse Mercator. While this projection is listed as ...
1
vote
1answer
31 views

Would it make sense to translate a city to latitude=0 longitude=0 before doing any calculations?

I'm working on a conversion system for Unity. We want to import some geo-referenced data (not models) losing the least floating point resolution possible. I am currently working on the idea of moving ...
0
votes
0answers
102 views

Calculate Tiles X,Y, Z for current view or extent in OpenLayers

Im using OpenLayers with the openstreetmap tile server. var urlTemplate = "http://c.tile.openstreetmap.org/{z}/{x}/{y}.png" I would like to download tiles for the current view or an extent. So ...
0
votes
1answer
57 views

Changing coordinate system of layer?

I am using ArcGIS 10.1 and I would like to change the coordinate system of a layer that is already attached to a drawing so that it matches the other layers.
0
votes
1answer
61 views

Using Near (proximity) tool in ArcGIS for Desktop?

I've tried changing GCS and PCS multiple ways but can't seem to figure out how to get the Near (from Proximity tools) to output the Near_DIST in feet. All it outputs is what looks like decimal degrees....
1
vote
1answer
35 views

Correct long / lat referencing typo in vector layer

This layer is completely misallinged in terms of the standard WGS84 referencing system. I played around a lot with affine transformations and the like. But I presume it is just a typo in the ...
1
vote
0answers
37 views

Coordinate System choice for Nearest Neighbor

Here's an interesting scenario I came upon yesterday and I wanted to throw it out as a question to try help me visualize what is happening. I have a single point (a person, say) who is looking for ...
3
votes
0answers
90 views

Creating custom CRS based on local project parameters in QGIS?

I'm having trouble creating custom proj4 CRS files to work with existing .shp files on local project coordinates. (Local in that the coordinates are relative only to themselves and not the 'real world'...
3
votes
1answer
84 views

Changing Dataframe Projection of .MXD to UTM Zone matching each polygon in ArcPy cursor?

I have a polygon shapefile. I used ArcPy scripts to: add a new field to the shapefile use Calculate UTM Zones on each polygon. It spits out UTM projection information into the field I've added. ...
3
votes
2answers
83 views

What kind of projection is this?

Can someone tell me what the projection is in this zone map from NOAA? I am trying to replicate it (or get close) in QGIS.
0
votes
1answer
64 views

Georeferencing PNG in ArcMap based off of data frame corners?

First, in Arcmap I set the data frame exactly equal to the page layout (2'hx3'w) and exported my hillshade, DEM, etc one after the other from layout view so that they were all the exact same size and ...
1
vote
0answers
57 views

Calculating areas in metric units on polygons that are stored in geographic coordinate reference system using ArcPy?

If one uses arcpy to calculate areas for a field in metric units on a polygon shapefile in a geographic coordinate system it will work, and give you plausible results. According to the documentation ...
3
votes
1answer
49 views

Assigning spatial info for NetCDF files using ArcGIS for Desktop?

I have quite a few NetCDF files that arrive from a air quality model without any spatial reference. However, I do have the spatial reference information that is required. Within Arc I use "make a ...
1
vote
1answer
37 views

Plot coordinates in ArcGIS 9.3 don't make sense

I have a layer of plot features in ArcGIS 9.3 that I want the UTM coordinates for. So I used the Feature to Point tool and then added XY coordinates to each point. I then viewed the Attribute table ...
2
votes
0answers
72 views

Changing projection on each page of data driven pages

I am working with data driven pages and a raster image of the world. I have a separate polygon shapefile of all of the UTM zones (with a polygon for zones 1-60, north and south, for a total of 120 ...
0
votes
1answer
76 views

Defining Projection Lambert Conformal Conical w custom GCS

I have a shape file from Mexico´s INEGI site that doesn´t have prj file. I am having trouble defining the projection in Arc. INEGI tells me it is projected as Lambert Conformal Conical with a ITRF92 ...